CN107877653A - Minimizing technology applied to furniture formaldehyde - Google Patents

Minimizing technology applied to furniture formaldehyde Download PDF

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Publication number
CN107877653A
CN107877653A CN201710983042.5A CN201710983042A CN107877653A CN 107877653 A CN107877653 A CN 107877653A CN 201710983042 A CN201710983042 A CN 201710983042A CN 107877653 A CN107877653 A CN 107877653A
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CN
China
Prior art keywords
parts
formaldehyde
furniture
sealed compartment
sucker
Prior art date
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Withdrawn
Application number
CN201710983042.5A
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Chinese (zh)
Inventor
张�杰
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Individual
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Individual
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Filing date
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Priority to CN201710983042.5A priority Critical patent/CN107877653A/en
Publication of CN107877653A publication Critical patent/CN107877653A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/26—Synthetic macromolecular compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/007—Treating of wood not provided for in groups B27K1/00, B27K3/00 using pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/0085—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
    • B27M3/18—Manufacture or reconditioning of specific semi-finished or finished articles of furniture or of doors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/708—Volatile organic compounds V.O.C.'s

Abstract

The invention discloses the minimizing technology applied to furniture formaldehyde, comprise the following steps：Furniture is placed in sealed compartment, and high-temperature steam is passed through into sealed compartment；Then negative pressure state is in carrying out exhausting, control sealed compartment in sealed compartment by air exhauster；Adsorbent equipment is put into sealed compartment, part sucker is fitted with furniture surface, opens blower fan, mobile adsorbent equipment makes sucker be moved back and forth on the surface of furniture；The circulation of air in sealed compartment is realized by air supply plant and air extractor, and to being heated in sealed compartment.The formaldehyde minimizing technology of the present invention, by carrying out high-temperature steam, negative pressure extracting successively to furniture surface, the operations such as adsorbent equipment extraction, by the formaldehyde quick release of furniture surface and it can extract, the air containing formaldehyde after extraction is carried out by purifying formaldehyde by adsorbent equipment simultaneously, the adsorption efficiency of formaldehyde is improved, so as to reduce the content of formaldehyde in furniture.

Description

Minimizing technology applied to furniture formaldehyde
Technical field
The present invention relates to a kind of formaldehyde minimizing technology, and in particular to the minimizing technology applied to furniture formaldehyde.
Background technology
Formaldehyde is more highly toxic material, and formaldehyde is in second on Chinese toxic chemical priority acccess control list.First Aldehyde is defined as carcinogenic and causes deformed material by the World Health Organization, is generally acknowledged allergen, and potential strong cause One of mutation-ure.Research shows that formaldehyde has strong carcinogenic and tumor promotion.Influence of the formaldehyde to health mainly shows In allotriosmia, stimulation, allergy, abnormal pulmonary function, dysfunction of liver and immunologic dysfunction etc..Its concentration is in atmosphere Reach 0.06-0.07mg/m3When, children will occur slightly to pant.When formaldehyde content in indoor air is 0.1mg/m3When, just There are peculiar smell and sense of discomfort；Reach 0.5mg/m3When, eyes can be stimulated, causes and sheds tears；Reach 0.6mg/m3, throat discomfort can be caused Or pain.When concentration is higher, nausea and vomiting can be caused, cough is uncomfortable in chest, asthma even pulmonary edema；Reach 30mg/m3When, can immediately Causing death.
With the continuous improvement of living standards of the people, decorations, purchase new furniture and turned into usual in people's life Thing.All kinds of wood-based plates are often largely used in decorations and Furniture manufacture, such as glued board, core-board, medium density fiber Plate, particieboard etc., and these wood-based plates are manufactured using formaldehyde system adhesive, mainly urea-formaldehyde resin adhesive, are deposited In Form aldehyde release problem, the main source usually polluted as formaldehyde in indoor air.
At present, the main method that people remove formaldehyde in indoor air pollution is to use formaldehyde remover, and formaldehyde is removed Agent is sprayed on furniture, but formaldehyde removal amount within a certain period of time is limited, and the persistence of effect is poor, the usual term of validity The only several days time, while also there is the defects of secondary pollution.
The content of the invention
The technical problems to be solved by the invention are that the main method that people remove formaldehyde in indoor air pollution is to use Formaldehyde remover, formaldehyde remover being sprayed on furniture or metope, formaldehyde removal amount within a certain period of time is limited, and The persistence of effect is poor, and the usual term of validity only has several days time, at the same also there is the defects of secondary pollution, and it is an object of the present invention to provide Applied to the minimizing technology of furniture formaldehyde, by carrying out high-temperature steam, negative pressure extracting successively to furniture surface, adsorbent equipment extracts Deng operation, by the formaldehyde quick release of furniture surface and can extract, while first will be contained after extraction by adsorbent equipment The air of aldehyde carries out purifying formaldehyde, without manually carrying out spraying formaldehyde remover, while avoids remover and is sprayed at The secondary pollution brought in air, and comprehensive absorption that furniture surface carries out formaldehyde can be more bonded, improve formaldehyde Adsorption efficiency, so as to reduce the content of formaldehyde in furniture.
The present invention is achieved through the following technical solutions：
Applied to the minimizing technology of furniture formaldehyde, comprise the following steps：1) furniture is placed in sealed compartment, and to sealing High-temperature steam, duration 30-45min are passed through in cabin；2) and then by air exhauster to carrying out exhausting, control sealing in sealed compartment Cabin is in negative pressure state 3-4h；3) adsorbent equipment is put into sealed compartment, the adsorbent equipment includes absorption cylinder, adsorbs cylinder Top end opening and be connected with hemispheric adsorption cover, adsorb and be connected with multiple suction pipes on cylinder outer wall, the end hinge of suction pipe Sucker is connected to, the sucker is hollow-core construction, and the surface of sucker offers multiple adsorption holes, and sucker passes through suction pipe and absorption cylinder It is connected, absorption cylinder includes exhausting chamber and the purify cavity below exhausting chamber, by more between exhausting chamber and purify cavity Individual vertical screen pipe is connected；Exhausting intracavitary is provided with multiple blower fans, and purify cavity is built with formaldehyde processing liquid；Adsorption hole covered with Filter membrane is adsorbed, adsorbs and is coated with formaldehyde remover on filter membrane, part sucker is fitted with furniture surface, opens blower fan, it is mobile Adsorbent equipment makes sucker be moved back and forth on the surface of furniture；4) air in sealed compartment is realized by air supply plant and air extractor Circulation, and to being heated in sealed compartment, temperature is 50-60 DEG C, keeps 24-48h.
The formaldehyde minimizing technology of the present invention, by carrying out high-temperature steam, negative pressure extracting, adsorbent equipment successively to furniture surface The operation such as extraction, by the formaldehyde quick release of furniture surface and can be extracted, while by adsorbent equipment by after extraction Air containing formaldehyde carries out purifying formaldehyde, without manually carrying out spraying formaldehyde remover, while avoids remover spray The secondary pollution brought in atmosphere is spilt, and can more be bonded comprehensive absorption that furniture surface carries out formaldehyde, is improved The adsorption efficiency of formaldehyde, so as to reduce the content of formaldehyde in furniture.Furniture is placed in sealed compartment at by high-temperature steam first Reason, the formaldehyde in furniture can be combined, formaldehyde is spun off from furniture, then pass through air exhauster with high-temperature steam Negative pressure is carried out, so as to which the steam being passed through and formaldehyde be extracted out；Then carried out by adsorbent equipment, the blower fan of exhausting intracavitary Exhausting, by sucker contact in furniture, so as to by among the air containing formaldehyde is further pumped into device in furniture, be inhaled passing through During attached hole, the formaldehyde in air can be carried out preliminary absorption, removed by formaldehyde remover, then be entered only by screen pipe again Change in chamber, comprehensive removal of formaldehyde is realized by formaldehyde processing liquid；Compared to go spray formaldehyde remover mode for, can keep away Exempt from secondary pollution, while the indoor circulation with outdoor air can be promoted, and adsorption area is wide, efficiency high, at the same not with The sucker of furniture surface contact the air in responsible extraction sealed compartment, avoids evaporateing into formaldehyde in air and is adsorbed onto furniture again Surface.
It is hinged between suction pipe and adsorption cover, suction pipe can rotate around hinged end, you can with residing for the surface according to furniture Angle, so as to rotate suction pipe, sucker is bonded with furniture surface, be advantageous to the extraction of formaldehyde.
The sucker is made using elastomeric material, can avoid that furniture surface is caused to damage.
The bottom of absorption cylinder is provided with roller, can be easy to remove to each local or move automatically.
The formaldehyde remover includes the raw material of following parts by weight：Folium artemisiae argyi 20-35 parts, white tea 50-70 parts, grape pip 70- 80 parts, dodecyl sodium sulfate 1-5 parts, urea 20-30 parts, ammonium chloride 5-10 parts, dispersant 1-10 parts, nanometer anion powder 10-50 parts, nano titanium oxide 5-10 parts, waterborne polyurethane resin 50-100 parts, water 300-600 parts can be effectively to taking out The formaldehyde in air is taken to carry out Adsorption.
The formaldehyde remover includes the raw material of following parts by weight：28 parts of folium artemisiae argyi, 60 parts of white tea, 75 parts of grape pip, 12 3 parts of sodium alkyl sulfonate, 25 parts of urea, 8 parts of ammonium chloride, 6 parts of dispersant, 30 parts of nanometer anion powder, 8 parts of nano titanium oxide, 75 parts of waterborne polyurethane resin, 450 parts of water.
The present invention compared with prior art, has the following advantages and advantages：
1st, the present invention is applied to the minimizing technology of furniture formaldehyde, by carrying out high-temperature steam, negative pressure successively to furniture surface Extract, the operations such as adsorbent equipment extracts, by the formaldehyde quick release of furniture surface and can extract, while filled by adsorbing Put and the air containing formaldehyde after extraction is subjected to purifying formaldehyde, without manually carrying out spraying formaldehyde remover, keep away simultaneously The secondary pollution that remover sprinkling is brought in atmosphere is exempted from, and can more be bonded furniture surface and carry out the comprehensive of formaldehyde Absorption, the adsorption efficiency of formaldehyde is improved, so as to reduce the content of formaldehyde in furniture；
2nd, the present invention is applied to the minimizing technology of furniture formaldehyde, is hinged between suction pipe and adsorption cover, and suction pipe can be around be hinged End rotates, you can with the angle residing for the surface according to furniture, so as to rotate suction pipe, the surface of sucker and furniture is pasted Close, be advantageous to the extraction of formaldehyde；
3rd, the present invention is applied to the minimizing technology of furniture formaldehyde, and the sucker is made using elastomeric material, can avoid pair Furniture surface causes to damage, and the bottom for adsorbing cylinder is provided with roller, can it is easy to remove to it is each place or moved automatically It is dynamic.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is schematic structural view of the invention.
Mark and corresponding parts title in accompanying drawing：
1- adsorbs cylinder, 2- adsorption covers, 3- suction pipes, 4- suckers, 5- adsorption holes, 6- purify cavities, 7- screen pipes, 8- blower fans.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make For limitation of the invention.
Embodiment
As shown in figure 1, the present invention is applied to the minimizing technology of furniture formaldehyde, comprise the following steps：1) furniture is placed on In sealed compartment, and high-temperature steam is passed through into sealed compartment, duration 30-45min；2) and then by air exhauster in sealed compartment Exhausting is carried out, control sealed compartment is in negative pressure state 3-4h；3) adsorbent equipment is put into sealed compartment, the adsorbent equipment includes Cylinder 1 is adsorbed, the top end opening of cylinder 1 is adsorbed and is connected with hemispheric adsorption cover 2, adsorb and be connected with the outer wall of cylinder 1 Multiple suction pipes 3, the end of suction pipe 3 are hinged with sucker 4, and the sucker 4 is hollow-core construction, and the surface of sucker 4 offers multiple suctions Attached hole 5, sucker 4 are connected by suction pipe 3 with absorption cylinder 1, and absorption cylinder 1 includes exhausting chamber and below exhausting chamber Purify cavity 6, it is connected between exhausting chamber and purify cavity 6 by multiple vertical screen pipes 7；Exhausting intracavitary is provided with multiple blower fans 8, Purify cavity 6 is built with formaldehyde processing liquid；Adsorption hole 5 adsorbs covered with absorption filter membrane and is coated with formaldehyde remover on filter membrane, by portion Divide sucker to be fitted with furniture surface, open blower fan, mobile adsorbent equipment makes sucker be moved back and forth on the surface of furniture；4) pass through Air supply plant realizes the circulation of air in sealed compartment with air extractor, and to being heated in sealed compartment, temperature is 50-60 DEG C, Keep 24-48h.
The formaldehyde minimizing technology of the present invention, by carrying out high-temperature steam, negative pressure extracting, adsorbent equipment successively to furniture surface The operation such as extraction, by the formaldehyde quick release of furniture surface and can be extracted, while by adsorbent equipment by after extraction Air containing formaldehyde carries out purifying formaldehyde, without manually carrying out spraying formaldehyde remover, while avoids remover spray The secondary pollution brought in atmosphere is spilt, and can more be bonded comprehensive absorption that furniture surface carries out formaldehyde, is improved The adsorption efficiency of formaldehyde, so as to reduce the content of formaldehyde in furniture.Furniture is placed in sealed compartment at by high-temperature steam first Reason, the formaldehyde in furniture can be combined, formaldehyde is spun off from furniture, then pass through air exhauster with high-temperature steam Negative pressure is carried out, so as to which the steam being passed through and formaldehyde be extracted out；Then carried out by adsorbent equipment, the blower fan of exhausting intracavitary Exhausting, by sucker contact in furniture, so as to by among the air containing formaldehyde is further pumped into device in furniture, be inhaled passing through During attached hole, the formaldehyde in air can be carried out preliminary absorption, removed by formaldehyde remover, then be entered only by screen pipe again Change in chamber, comprehensive removal of formaldehyde is realized by formaldehyde processing liquid；Compared to go spray formaldehyde remover mode for, can keep away Exempt from secondary pollution, while the indoor circulation with outdoor air can be promoted, and adsorption area is wide, efficiency high, at the same not with The sucker of furniture surface contact the air in responsible extraction sealed compartment, avoids evaporateing into formaldehyde in air and is adsorbed onto furniture again Surface.
Preferably, it is hinged between suction pipe and adsorption cover, suction pipe can rotate around hinged end, you can with according to furniture or wall Angle residing for the surface of wall, so as to rotate suction pipe, sucker and the surface of furniture or wall is bonded, be advantageous to formaldehyde Extraction.
Preferably, the sucker is made using elastomeric material, can avoid that furniture or wall surface are caused to damage.
Preferably, the bottom for adsorbing cylinder is provided with roller, can it is easy to remove to it is each place or move automatically.
Preferably, the formaldehyde remover includes the raw material of following parts by weight：Folium artemisiae argyi 20-35 parts, white tea 50-70 parts, Portugal Grape seed 70-80 parts, dodecyl sodium sulfate 1-5 parts, urea 20-30 parts, ammonium chloride 5-10 parts, dispersant 1-10 parts, nanometer are born Ion powder 10-50 parts, nano titanium oxide 5-10 parts, waterborne polyurethane resin 50-100 parts, water 300-600 parts can be effective Ground carries out Adsorption to the formaldehyde extracted in air.
Preferably, the formaldehyde remover includes the raw material of following parts by weight：28 parts of folium artemisiae argyi, 60 parts of white tea, grape pip 75 Part, 3 parts of dodecyl sodium sulfate, 25 parts of urea, 8 parts of ammonium chloride, 6 parts of dispersant, 30 parts of nanometer anion powder, nanometer titanium dioxide 8 parts of titanium, 75 parts of waterborne polyurethane resin, 450 parts of water.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include Within protection scope of the present invention.

Claims (6)

1. the minimizing technology applied to furniture formaldehyde, it is characterised in that comprise the following steps：1) furniture is placed on sealed compartment In, and high-temperature steam is passed through into sealed compartment, duration 30-45min；2) and then by air exhauster to being taken out in sealed compartment Wind, control sealed compartment are in negative pressure state 3-4h；3) adsorbent equipment is put into sealed compartment, the adsorbent equipment, which includes absorption, to be justified Cylinder (1), the top end opening of absorption cylinder (1) are simultaneously connected with hemispheric adsorption cover (2), adsorb and connect on cylinder (1) outer wall There are multiple suction pipes (3), the end of suction pipe (3) is hinged with sucker (4), and the sucker (4) is hollow-core construction, the surface of sucker (4) Multiple adsorption holes (5) are offered, sucker (4) is connected by suction pipe (3) with absorption cylinder (1), and absorption cylinder (1) includes exhausting Chamber and the purify cavity (6) below exhausting chamber, pass through multiple vertical screen pipes (7) between exhausting chamber and purify cavity (6) It is connected；Exhausting intracavitary is provided with multiple blower fans (8), and purify cavity (6) is built with formaldehyde processing liquid；Adsorption hole (5) is covered with absorption Filter membrane, adsorb and be coated with formaldehyde remover on filter membrane, part sucker is fitted with furniture surface, open blower fan, mobile absorption Device makes sucker be moved back and forth on the surface of furniture；4) stream of air in sealed compartment is realized by air supply plant and air extractor It is logical, and to being heated in sealed compartment, temperature is 50-60 DEG C, keeps 24-48h.
2. the minimizing technology according to claim 1 applied to furniture formaldehyde, it is characterised in that suction pipe (3) and adsorption cover (2) it is hinged between, suction pipe (3) can rotate around hinged end.
3. the minimizing technology according to claim 1 applied to furniture formaldehyde, it is characterised in that the sucker (4) uses Elastomeric material is made.
4. the minimizing technology according to claim 1 applied to furniture formaldehyde, it is characterised in that the bottom of absorption cylinder (1) Portion is provided with roller.
5. the minimizing technology according to claim 1 applied to furniture formaldehyde, it is characterised in that the formaldehyde remover bag Include the raw material of following parts by weight：Folium artemisiae argyi 20-35 parts, white tea 50-70 parts, grape pip 70-80 parts, dodecyl sodium sulfate 1-5 parts, Urea 20-30 parts, ammonium chloride 5-10 parts, dispersant 1-10 parts, nanometer anion powder 10-50 parts, nano titanium oxide 5-10 parts, Waterborne polyurethane resin 50-100 parts, water 300-600 parts.
6. the minimizing technology according to claim 1 applied to furniture formaldehyde, it is characterised in that the formaldehyde remover bag Include the raw material of following parts by weight：28 parts of folium artemisiae argyi, 60 parts of white tea, 75 parts of grape pip, 3 parts of dodecyl sodium sulfate, 25 parts of urea, chlorine Change 8 parts of ammonium, 6 parts of dispersant, 30 parts of nanometer anion powder, 8 parts of nano titanium oxide, 75 parts of waterborne polyurethane resin, water 450 Part.
CN201710983042.5A 2017-10-20 2017-10-20 Minimizing technology applied to furniture formaldehyde Withdrawn CN107877653A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710983042.5A CN107877653A (en) 2017-10-20 2017-10-20 Minimizing technology applied to furniture formaldehyde

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710983042.5A CN107877653A (en) 2017-10-20 2017-10-20 Minimizing technology applied to furniture formaldehyde

Publications (1)

Publication Number Publication Date
CN107877653A true CN107877653A (en) 2018-04-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710983042.5A Withdrawn CN107877653A (en) 2017-10-20 2017-10-20 Minimizing technology applied to furniture formaldehyde

Country Status (1)

Country Link
CN (1) CN107877653A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111389172A (en) * 2020-05-11 2020-07-10 上海雅珂贸易有限公司 High-efficient quick formaldehyde removal equipment
CN112293839A (en) * 2020-10-30 2021-02-02 南兴装备股份有限公司 Cloth and ear belt cooperation attaching device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111389172A (en) * 2020-05-11 2020-07-10 上海雅珂贸易有限公司 High-efficient quick formaldehyde removal equipment
CN112293839A (en) * 2020-10-30 2021-02-02 南兴装备股份有限公司 Cloth and ear belt cooperation attaching device

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Application publication date: 20180406